Given that WordPress is still growingWP is about a third of the web now, as of April 2019, there's no shortage of work for proper WordPress developers. In my case, work comes from several sources, all of it freelance. The vast majority of work I do is retainer. Agencies/companies need me to come into a sprint, usually for the stuff that's a bit too much for juniors.
Since every project is different, the workflow is usually unique as well. Unless I'm involved with the engineering at project kick-off, I usually have to adapt to what's been put in place by other developers. Typically that means writing custom shell scripts and aliases to help sync both code and content.